The GéoSabrina design: the way to build a GIS above a spatial data server. - Didier Chrétien; Yann Viémont; Thierry Larue; R. Legoff; Dominique Pastre (SAC, 1994)

Cost-Controlled OFL Rewriting Rules for Multiple Collection Traversals. - Didier Chrétien; Fernando Machuca; Puthirak Om; Zhao-Hui Tang (International Hong Kong Computer Society Database Workshop, 1996)